Time of Flight Measurement of Cesium Magneto-Optical Trap

• Main Authors: Shih-Pin Wang, 王士賓
• Other Authors: Chin-Chun Tsai
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/ws2cc9

碩士 === 國立成功大學 === 物理學系碩博士班 === 90 === Abstract Laser cooling and trapping is a novel technique to manipulate the neutral atoms and molecules. The cesium atom was loaded into the magneto-optical trap (MOT) for studying the physical properties of atoms at low temperature. In this experiment, the temperature of cesium atoms within the optical molasses was taken by the time of flight method (TOF). The position was recorded when they were expanding inside the optical molasses. The velocity and therefore the temperature of cesium atoms can be calculated. The velocity was about 1.5㎝/s corresponding to the temperature was about 3.6μK. This temperature is under estimate due to the time resolution (33ms) and the projection of atom cloud into the transverse section of the observe axis. We tried a digital CCD camera and measured the right timing from the computer controlled time sequence. However, no significant results yet.